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I just replaced my the differential cover with a cover from a Z4 while I installed a Quaife LSD. This is not a DIY for the procedure. However, I did want to point out two items that are required for a proper install that I didn't know about when I ordered my cover.

The Z4 cover is a direct bolt on for non-M3 E46 differentials. However, you need to purchase two additional items: 1)Loctite 5970 Gasket Maker, and 2)one 60mm diff bolt (M10X60-8.8-ZNS up to 9/03 build or M10X60-10.9ZNS3 from 9/03)

You won't find diff gaskets any more; BMW uses the loctite in lieu of a gasket. The loctite is difficult to find outside of BMW dealerships, but it is out there. BMW charges about $45 a tube. Off the shelf products will not resist gear oil the way the loctite product does; the diff will leak after awhile.

Although you can reuse the bolts from your old diff, the Z4 cover requires one bolt that is longer than the others.

Just so you know, the run of the mill loctite silicone sealant will work for the diff. For example, the ultra-black will be suffice. For any of you old timers, Permatex Aviation form-a-gasket is excellent (Indian Head Shellac works too) is a cheap alternative.

FYI: Red loctite all of the diff cover bolts if you track your car and run solid bushings. This is a great way to reduce your maintenance time between events (I use a bunch of red loctite on my cars).

I just replaced my the differential cover with a cover from a Z4 while I installed a Quaife LSD. This is not a DIY for the procedure. However, I did want to point out two items that are required for a proper install that I didn't know about when I ordered my cover.

The Z4 cover is a direct bolt on for non-M3 E46 differentials. However, you need to purchase two additional items: 1)Loctite 5970 Gasket Maker, and 2)one 60mm diff bolt (M10X60-8.8-ZNS up to 9/03 build or M10X60-10.9ZNS3 from 9/03)

Thread resurrection here, but I've just purchased a LSD an awaiting it arrival. I plan on installing the Z4 finned diff cover, my car is a pre 03 model so i will be buying the M10x60-8.8-ZNS version of the long bolt. However for the remaining 7 bolts will i need my E46 bolts or the equivalent Z4 bolts for models up to 09/2003?

For those interested and wondering why install the z4 cover, the fins help keep the diff oil cooler and thus better protection for the diff itself. E46's didnt have diff fins.

p/n for this cover 33117512980.
It's just finned transmission cover, in case of BMW e46 - only for e46 330(i/Ci/Ci Convertible) for USA with Performance package. Actualy it's a first time when I see "BMW Motorsport" for this cover.
But, in case of e46, this cover fit fine to any TYP 188K differentials